is at hand a cmos battery within the Dell Inspiron 1545 laptop, if so where is it located?

I have a Dell Inspiron 1545 laptop and there is a error message pertaining to the clock. It shall not even allow me to go to the bios screen. I know that when there's a problem with the inside clock that it's most likely related to the CMOS BATTERY. Any idea where it's located or if this archetype even has 1.

Steve